Sewing-machine.



A. J. BRIGGS.

SEWING MACHINE.

APPLICATION FILED OCT. 11. 1913.

' 1,147,139. Patented July 20, 1915.

UNITED sTATEs PATENT oEEroE.

ARTHUR J. BRIGGS, OF SYRACUSE, NEW YORK, ASSIGNOR TO THE VANNET'IE BOBBINLESS SEWING MACHINE COMPANY, OF AMSTERDAM, NEW YORK, A

CORPORATION OF NEW YORK.

SEWING-MACHINE.

Specification of Letters Patent. Patented July 20, 1915.

Application fi1ed October 17, 1913. Serial No. 795,664.

To all whom it may concern:

Be it known that I, ARTHUR J. Bnroes, citizen of the United States, and resident of Syracuse, in the county of Onondaga and State of New York, have inventedcertain new and useful Improvements in Sewing Machines, of which the following is a specification. I I

In the usual operation of a sewingrnachine, the machine is stopped at the end of a sewing operation, after which the operator lifts the presser from engagement with the work by means of a suitable hand-lever to permit of the work being readily removed from thereunder. Preliminary tohagain starting the machine and after the work has beenplaced in'proper position on thebedplate to be acted on by the sewing mechanism the operator again lowers the presser into engagement with the work by a proper manipulation of'its lifting lever. To avoid this operating of the presser by theoperator prior and subsequent to each sewing operation and render thesame automatic, a mechanism has heretofore been provided and made the subject of Patent BIO/1,096,407, dated May 12, 1914:, which comprises means adapted to be operated from the driving shaft of the machine for lifting the presser from the work upon the stopping of the machine, and automaticallyreleasing said presser to permit it to lower into engagement with the work upon the re-starting of the machine, this presser liftingand releasing means being controllable by the operator during the sewing operation to render it operative or inoperative.

means of the novel construction, arrangement and combmation of parts asset forth in the detailed description of the invention which follows.

Referring now to theaccompanying draW ings in which I have shown only so much of a sewing machine as s necessary to illus'" p lever and connected presser'.

The object of my invention is to improve the presser lifting and releasing mechanism. of the foregoing patent by rendering itmore simple and efiicient. This I accomplish by 2 is a similar view showing a different position of the parts. Fig. 3 is a section on the line 3-3 of Fig. 2, looking in the direction indicated by the arrows, and also showing in addition the front end of the driving shaft and its attachedcrank in operative relation with the other parts in said figure.

Similar reference characters indicate like parts in the several figures of the drawings.

The face-plate 2, adapted to be detachably connected to the front end of the overhang ing bracket arm 3 of the machine frame and forming a part of said frame; the driving shaft 4 having atvits front end a grooved crank 5; the vertically reciprocating needlebar 6 operated from said crank through the connecting link 7; the vertically movable presser 8 yieldingly held in a normally lowered position by a spring 9 acting-against a collar 10 thereon; and the pivoted presserlifting hand-lever 11 adapted to co-act with a laterally projecting pin or stud 12 on the collar 10 of the pressenare all of usual construction and operation.

I will now describe my improved presser lifting means. This means, as here shown, comprises a lever 13 having at one end a hub-sleeve 14 mounted for both pivotal and sliding movements on a fixed stud 15, and at its opposite end having a loose connection with the presser through a link 16 connecting with the pin 12 on said presser. This lever 13 is adapted to be shifted by a sliding movement of its hub-sleeve on the stud 15 to and from position for engagement by a rotary cam 17 which will-operate to lift the This lifting cam 17 may be operated from the driving shaft'it in any suitable or convenient manner. As here shown it is mounted on a short shaft 18 journaled in the face-plate 2, which shaft is operated from the driving shaft 4i by means of a crank arm 19 thereon having a.CI'2Li1k-pin 20 in engagement with the grooved crank 5 on the driving shaft as shown. In the present case the needle-bar linker pitinan 7 also conneotswith said crank-pin20 to be operated thereby from the crank 5.

The lifting cam 17 being operated from the driving shaft in the manner described, has a continuously rotating movement during the operation of the machine. The presser, however, ordinarily is to be lifted only at the end of each sewing operation. For such reason the presser lifting lever 13 is normally held during the sewing operation in inoperative position away from engagement with its lifting camsaid inoperative position of the lever being at one side or forward of the plane of rotation of the cam as shown by dotted lines in Fig. 3-whereby the presser will remain in its lowered operative position in engagement with the work. At the end of a sewing operation, however, and as the machine is slowed down just preparatory to stopping the same, the operator may shift the lifting lever on its supporting stud 15, through the medium of devices to be presently described, to a positon to bring an arm 21 thereon into the path of movement of the lifting cam 17 whereupon the latter will engage therewith and lift the lever and connected presser as shown in Fig. 2. The link connection be tween the lifting lever 13 and the presser pin 12 is sufiiciently loose to permit of the shifting of the lifting lever on its supporting stud 15, in the manner just referred to,

independently of the presser, that is, without causing an appreciable movement of the presser.

The lifting of the presser to its highest point is effected at a time when, the take-up" (notshown) and the needle-bar are in their raised positions, and in order that the machine may be brought to a stop with the parts in such positions, the lifting cam and the lifting lever are provided with stop shoulders 22 and 23 respectively, which cooperate, as shown in Fig. 2, to permit the operator to determine the proper stopping position of the machine. hen the machine is again started, the rotation of the lifting cam will permit the lowering of the lifting lever and connected presser under the action of the spring 9 until the presser contacts with the work, as shown in Fig. 1, immediately following which the lifting lever will be automatically shifted to its inoperative position, as indicated by dotted lines in Fig. 3.

The means for shifting the lifting lever by a sliding movement on the stud 15 to and from its operative position for engagement by the lifting cam, comprises a rockshaft 25 journaled in a bearing 26 in the face-plate 2 and at one end having acrank arm 27 loosely engaging the hub sleeve 14 of the lifting lever within a recess 28 therein (see Fig. 3) and at its opposite end extending through the wall of the face-plate to a point exterior thereof, and there having a second crank arm 30; this second crank arm serving as an operating handle for turning the rock-shaft and its inner arm 27 to shift the lever on its stud 15. A coiled spring 29 on the rock-shaft operates to normally hold the lifting lever in its inoperative position. v

What I claim is 1. In a sewing machine, the combination with the presser and the driving shaft, of a rotary lifting cam operated from said shaft, a lever operatively connected with the presser and being mounted for both pivotal and sliding movements, its sliding movement being in the direction of the axis of the lifting cam, and means for sliding the lever to and from a position for engagement by the lifting cam.

2. In asewing machine, the combination with the presser andthe driving shaft, of a rotary lifting cam operated from said shaft, a lever operatively connected with the, presser and being mounted for both pivotal and sliding movements, its sliding movement being in the direction of the axis of the lifting cam, and means for sliding the lever to and from a position for engagement by the lifting cam, said means comprising a rock-shaft having an arm in operative connection with the lever and ,a second arm serving as an operating handle for engagement by the operator.

3. In a sewing machine, the combination with the presser and the driving shaft, of a rotary lifting cam connected to and operated by said shaft, a lever operatively connected with the presser and being mounted for both pivotal and sliding movements, its sliding movement being in the direction of the axis of the lifting cam, and means for sliding the lever to and from a position for engagement by the lifting cam, said lifting cam and lever being provided with cooperating stop shoulders.

Signed at Syracuse, in the county of Onondaga, and State of New York, this 14th day of October A. D. 1913.

' ARTHUR J. BRIGGS.

Witnesses:

E. S. BOYNTON, GEO. C. PIERCE.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of 'I Patents,

' Washington, D. G. 

